/*******************************************************************************
 * Copyright (c) 2004, 2014 IBM Corp. and others
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 *******************************************************************************/
package com.ibm.j9ddr.corereaders;

import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.stream.ImageInputStream;

public class ShutdownHook extends Thread
{
	List<WeakReference<ImageInputStream>> _openFiles = null;

	public ShutdownHook()
	{
		_openFiles = new ArrayList<WeakReference<ImageInputStream>>();
	}

	public void addFile(ImageInputStream file)
	{
		_openFiles.add(new WeakReference<ImageInputStream>(file));
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Thread#run()
	 */
	public void run()
	{
		for (WeakReference<ImageInputStream> reference : _openFiles) {
			ImageInputStream reader = reference.get();
			if (null != reader) {
				try {
					reader.close();
				} catch (IOException e) {
					// we are shutting down so just ignore this
				}
			}
		}
	}

}
